I have two very general questions regarding QOS best practices:
1) Does anyone have a link that explains QOS, how to implement and the best practices for implementing on a WAN?
2) Would QOS be done on the WAN router, the remote router or the switches? It seems that it would be easiest to set QOS on the csu/dsu, but would it be better to apply that QOS to each interface on the LAN switch?
QOS is done mostly at the router level (or lan switch) (from customer point of view) and at the provider point of view, they do it on the wan switches. Not all CSUs have the option to do QoS. Even if they allow, mostly the options available will be minimal. Doing QoS on the CSU only helps to do it at the layer 2. Cisco IOS has a lot of QoS options both at the router and switch level.
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